鼠標跟隨圖片看大圖
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>跟隨鼠標移動（大圖展示）</title>
<style type="text/css">
html,body{overflow:hidden;}
body,div,ul,li{margin:0;padding:0;}
#box ul{width:768px;height:172px;list-style-type:none;margin:10px auto;}
#box li{float:left;width:170px;height:170px;cursor:pointer;display:inline;border:1px solid #ddd;margin:0 10px;}
#box li.active{border:1px solid #a10000;}
#box li img{width:170px;height:170px;vertical-align:top;}
#big{position:absolute;width:400px;height:400px;border:2px solid #ddd;display:none;}
#big div{position:absolute;top:0;left:0;width:400px;height:400px;opacity:0.5;filter:alpha(opacity=50);background:#fff url(http://js.fgm.cc/learn/lesson5/img/loading.gif) 50% 50% no-repeat;}
</style>
<script type="text/javascript">
window.onload = function ()
{
var aLi = document.getElementsByTagName("li");
var oBig = document.getElementById("big");
var oLoading = oBig.getElementsByTagName("div")[0];
var i = 0;
for (i = 0; i < aLi.length; i++)
{
aLi[i].index = i;
//鼠標劃過, 預加載圖片插入容器並顯示
aLi[i].onmouseover = function ()
{
var oImg = document.createElement("img");
//圖片預加載
var img = new Image();
img.src = oImg.src = aLi[this.index].getElementsByTagName("img")[0].src.replace(".jpg","_big.jpg");
//插入大圖片
oBig.appendChild(oImg);
//鼠標移過樣式
this.className = "active";
//顯示big
oBig.style.display = oLoading.style.display = "block";
//判斷大圖是否加載成功
img.complete ? oLoading.style.display = "none" : (oImg.onload = function() {oLoading.style.display = "none";})
};
//鼠標移動, 大圖容器跟隨鼠標移動
aLi[i].onmousemove = function (event)
{
var event = event || window.event;
var iWidth = document.documentElement.offsetWidth - event.clientX;
//設置big的top值
oBig.style.top = event.clientY + 20 + "px";
//設置big的left值, 如果右側顯示區域不夠, 大圖將在鼠標左側顯示.
oBig.style.left = (iWidth < oBig.offsetWidth + 10 ? event.clientX - oBig.offsetWidth - 10 : event.clientX + 10) + "px";
};
//鼠標離開, 刪除大圖並隱藏大圖容器
aLi[i].onmouseout = function ()
{
this.className = "";
oBig.style.display = "none";
//移除大圖片
oBig.removeChild(oBig.lastChild)
}
}
};
</script>
</head>
<body>
<div id="box">
<ul>
<li><img src="http://js.fgm.cc/learn/lesson5/img/shirt_1.jpg" /></li>
<li><img src="http://js.fgm.cc/learn/lesson5/img/shirt_2.jpg" /></li>
<li><img src="http://js.fgm.cc/learn/lesson5/img/shirt_3.jpg" /></li>
<li><img src="http://js.fgm.cc/learn/lesson5/img/shirt_4.jpg" /></li>
</ul>
</div>
<div id="big"><div></div></div>
</body>
</html>
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